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Poker downswing calculator

Updated August 2026 · by Tom Howcroft

US edition. See how deep a normal downswing runs for your win rate and standard deviation, in big blinds and buy-ins, before you panic.

What does this result mean?

A poker downswing calculator estimates the scale of a normal drawdown for a player with a given win rate and standard deviation. A thin edge and volatile results create deeper losing stretches, even when the player remains a long-term winner. The output is best read as an order-of-magnitude planning figure, not a maximum loss or a prediction of the next downswing. Real paths can be shorter, longer or interrupted by recovery. Use conservative inputs from the game you actually play and compare the result with your bankroll, stop rules and emotional limits before a bad run starts. If a live downswing falls inside the model, keep logging and review the decisions rather than assuming the result proves a leak. If repeated hand evidence points to mistakes, fix those mistakes even when the drawdown itself is statistically ordinary.

4
90
10.1 buy-ins
Expected downswing
1,012.5
In big blinds

A downswing is mostly variance, not broken play. The thinner your edge and the bigger your swings, the deeper a perfectly normal downswing goes.

Example

A 4 BB/100 winner with 90 BB/100 standard deviation should expect a normal downswing on the order of 1,000 BB, about 10 buy-ins.

Estimates for study and planning only, not a profit promise. Overshove tracks your real sample so these inputs come from your own data.

What does this calculator compute?

The calculator estimates a normal drawdown from your edge and swing rate. Thin edges and high standard deviation produce deeper stretches, even when the player is still a long-term winner.

When should the result change your decision?

Use it before deciding a losing spell means the game is broken. A normal downswing still needs review, but it should not automatically trigger a stake jump, panic drop or revenge session.

How to use the answer responsibly

Treat the calculator as a planning tool, not a verdict on one session. A live poker input is usually an estimate: your win rate is noisy, your standard deviation changes by game type, and your future volume rarely matches the clean number you type into a form. The useful habit is to save the assumptions beside the result so you know what would need to change before the decision changes.

If the result pushes against what you wanted to do, do not smooth the inputs until the answer feels nicer. Make the conservative version first, using a lower win rate, a higher swing rate or fewer weekly hours. Then run the optimistic version. The space between those answers is the real decision area: where a shot needs a stop rule, where a move up needs more buy-ins, or where a good-looking hourly still needs a bigger sample.

Overshove calculators become more useful when the inputs come from your own logged sessions. Rake, tips, travel, hours, stake mix and session length all change the number. A generic benchmark can teach the shape of the problem, but a clean personal log gives the number you should actually act on.

Questions

How deep is a normal downswing?

Deeper than most expect. Expected depth scales with your standard deviation squared over twice your win rate, so a thin edge with big swings can see normal downswings of 10 or more buy-ins.

Does a downswing mean I am playing badly?

Not necessarily. A normal downswing is mostly variance. Review your tagged hands to tell a genuine leak from a run of bad outcomes.

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